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[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] \t special character  T_VARIABLE tokens  Tatroe, Kevin  2nd  test expressions      assignment vs. comparison      for( ) loops and      negation operator and      return values of functions and  text boxes, setting default values in  text in PHP  time parts  time( )      cookie expiration times, creating  times  [See dates and times] timestamps  [See epoch timestamps] tokens used by PHP interpreter  Trachtenberg, Adam  2nd  track_errors configuration directive  2nd  trim( )      combining with strlen( )      removing newlines  true (truth value)      equality operator and      negation operator and      return values of functions      validating form elements      while( ) and  truncating strings with substr( )

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